最近看了下Node.js，基于V8的服务端javascript，有点意思，就写了个简单的文件夹系统，用于列出系统的某个文件夹下的文件，并可以实现下载。不过对于比较大的文件，可能会有点问题。cygwin版本node.js及代码下载地址为猛击下载。
filesystem.js
/***
* @author flyingzl
* @date 2010-11-27
* 一个基于Node.js的简单文件服务器
*/
var fs=require("fs"),
http=require("http"),
url=require("url"),
path=require("path"),
mime=require("./mime").mime,
util=require('util');
//www根目录
var root=__dirname,
host="127.0.0.1",
port="8888";
if(!path.existsSync(root)){
util.error(root+"文件夹不存在，请重新制定根文件夹！");
process.exit();
}
//显示文件夹下面的文件
function listDirectory(parentDirectory,req,res){
fs.readdir(parentDirectory,function(error,files){
var body=formatBody(parentDirectory,files);
res.writeHead(200,{
"Content-Type":"text/html;charset=utf-8",
"Content-Length":Buffer.byteLength(body,'utf8'),
"Server":"NodeJs("+process.version+")"
});
res.write(body,'utf8');
res.end();
});
}
//显示文件内容
function showFile(file,req,res){
fs.readFile(filename,'binary',function(err,file){
var contentType=mime.lookupExtension(path.extname(filename));
res.writeHead(200,{
"Content-Type":contentType,
"Content-Length":Buffer.byteLength(file,'binary'),
"Server":"NodeJs("+process.version+")"
});
res.write(file,"binary");
res.end();
})
}
//在Web页面上显示文件列表，格式为<ul><li></li><li></li></ul>
function formatBody(parent,files){
var res=[],
length=files.length;
res.push("<!doctype>");
res.push("<html>");
res.push("<head>");
res.push("<meta http-equiv='Content-Type' content='text/html;charset=utf-8'></meta>")
res.push("<title>Node.js文件服务器</title>");
res.push("</head>");
res.push("<body width='100%'>");
res.push("<ul>")
files.forEach(function(val,index){
var stat=fs.statSync(path.join(parent,val));
if(stat.isDirectory(val)){
val=path.basename(val)+"/";
}else{
val=path.basename(val);
}
res.push("<li><a href='"+val+"'>"+val+"</a></li>");
});
res.push("</ul>");
res.push("<div style='position:relative;width:98%;bottom:5px;height:25px;background:gray'>");
res.push("<div style='margin:0 auto;height:100%;line-height:25px;text-align:center'>Powered By Node.js</div>");
res.push("</div>")
res.push("</body>");
return res.join("");
}
//如果文件找不到，显示404错误
function write404(req,res){
var body="文件不存在:-(";
res.writeHead(404,{
"Content-Type":"text/html;charset=utf-8",
"Content-Length":Buffer.byteLength(body,'utf8'),
"Server":"NodeJs("+process.version+")"
});
res.write(body);
res.end();
}
//创建服务器
http.createServer(function(req,res){
//将url地址的中的%20替换为空格，不然Node.js找不到文件
var pathname=url.parse(req.url).pathname.replace(/%20/g,' '),
re=/(%[0-9A-Fa-f]{2}){3}/g;
//能够正确显示中文，将三字节的字符转换为utf-8编码
pathname=pathname.replace(re,function(word){
var buffer=new Buffer(3),
array=word.split('%');
array.splice(0,1);
array.forEach(function(val,index){
buffer[index]=parseInt('0x'+val,16);
});
return buffer.toString('utf8');
});
if(pathname=='/'){
listDirectory(root,req,res);
}else{
filename=path.join(root,pathname);
path.exists(filename,function(exists){
if(!exists){
util.error('找不到文件'+filename);
write404(req,res);
}else{
fs.stat(filename,function(err,stat){
if(stat.isFile()){
showFile(filename,req,res);
}else if(stat.isDirectory()){
listDirectory(filename,req,res);
}
});
}
});
}
}).listen(port,host);
util.debug("服务器开始运行 http://"+host+":"+port)
接下来是mime.js文件，用于探测文件的类型，比如是txt还是js文件等。
mime.js
var mime = {
//查找文件后缀类型
lookupExtension : function(ext, fallback) {
return mime.TYPES[ext.toLowerCase()] || fallback || 'text/plain';
},
//文件类型
TYPES : { ".3gp" : "video/3gpp"
, ".a" : "application/octet-stream"
, ".ai" : "application/postscript"
, ".aif" : "audio/x-aiff"
, ".aiff" : "audio/x-aiff"
, ".asc" : "application/pgp-signature"
, ".asf" : "video/x-ms-asf"
, ".asm" : "text/x-asm"
, ".asx" : "video/x-ms-asf"
, ".atom" : "application/atom+xml"
, ".au" : "audio/basic"
, ".avi" : "video/x-msvideo"
, ".bat" : "application/x-msdownload"
, ".bin" : "application/octet-stream"
, ".bmp" : "image/bmp"
, ".bz2" : "application/x-bzip2"
, ".c" : "text/x-c"
, ".cab" : "application/vnd.ms-cab-compressed"
, ".cc" : "text/x-c"
, ".chm" : "application/vnd.ms-htmlhelp"
, ".class" : "application/octet-stream"
, ".com" : "application/x-msdownload"
, ".conf" : "text/plain"
, ".cpp" : "text/x-c"
, ".crt" : "application/x-x509-ca-cert"
, ".css" : "text/css"
, ".csv" : "text/csv"
, ".cxx" : "text/x-c"
, ".deb" : "application/x-debian-package"
, ".der" : "application/x-x509-ca-cert"
, ".diff" : "text/x-diff"
, ".djv" : "image/vnd.djvu"
, ".djvu" : "image/vnd.djvu"
, ".dll" : "application/x-msdownload"
, ".dmg" : "application/octet-stream"
, ".doc" : "application/msword"
, ".dot" : "application/msword"
, ".dtd" : "application/xml-dtd"
, ".dvi" : "application/x-dvi"
, ".ear" : "application/java-archive"
, ".eml" : "message/rfc822"
, ".eps" : "application/postscript"
, ".exe" : "application/x-msdownload"
, ".f" : "text/x-fortran"
, ".f77" : "text/x-fortran"
, ".f90" : "text/x-fortran"
, ".flv" : "video/x-flv"
, ".for" : "text/x-fortran"
, ".gem" : "application/octet-stream"
, ".gemspec" : "text/x-script.ruby"
, ".gif" : "image/gif"
, ".gz" : "application/x-gzip"
, ".h" : "text/x-c"
, ".hh" : "text/x-c"
, ".htm" : "text/html"
, ".html" : "text/html"
, ".ico" : "image/vnd.microsoft.icon"
, ".ics" : "text/calendar"
, ".ifb" : "text/calendar"
, ".iso" : "application/octet-stream"
, ".jar" : "application/java-archive"
, ".java" : "text/x-java-source"
, ".jnlp" : "application/x-java-jnlp-file"
, ".jpeg" : "image/jpeg"
, ".jpg" : "image/jpeg"
, ".js" : "application/javascript;charset=utf-8"
, ".json" : "application/json"
, ".log" : "text/plain;charset=utf-8"
, ".m3u" : "audio/x-mpegurl"
, ".m4v" : "video/mp4"
, ".man" : "text/troff"
, ".mathml" : "application/mathml+xml"
, ".mbox" : "application/mbox"
, ".mdoc" : "text/troff"
, ".me" : "text/troff"
, ".mid" : "audio/midi"
, ".midi" : "audio/midi"
, ".mime" : "message/rfc822"
, ".mml" : "application/mathml+xml"
, ".mng" : "video/x-mng"
, ".mov" : "video/quicktime"
, ".mp3" : "audio/mpeg"
, ".mp4" : "video/mp4"
, ".mp4v" : "video/mp4"
, ".mpeg" : "video/mpeg"
, ".mpg" : "video/mpeg"
, ".ms" : "text/troff"
, ".msi" : "application/x-msdownload"
, ".odp" : "application/vnd.oasis.opendocument.presentation"
, ".ods" : "application/vnd.oasis.opendocument.spreadsheet"
, ".odt" : "application/vnd.oasis.opendocument.text"
, ".ogg" : "application/ogg"
, ".p" : "text/x-pascal"
, ".pas" : "text/x-pascal"
, ".pbm" : "image/x-portable-bitmap"
, ".pdf" : "application/pdf"
, ".pem" : "application/x-x509-ca-cert"
, ".pgm" : "image/x-portable-graymap"
, ".pgp" : "application/pgp-encrypted"
, ".pkg" : "application/octet-stream"
, ".pl" : "text/x-script.perl"
, ".pm" : "text/x-script.perl-module"
, ".png" : "image/png"
, ".pnm" : "image/x-portable-anymap"
, ".ppm" : "image/x-portable-pixmap"
, ".pps" : "application/vnd.ms-powerpoint"
, ".ppt" : "application/vnd.ms-powerpoint"
, ".ps" : "application/postscript"
, ".psd" : "image/vnd.adobe.photoshop"
, ".py" : "text/x-script.python"
, ".qt" : "video/quicktime"
, ".ra" : "audio/x-pn-realaudio"
, ".rake" : "text/x-script.ruby"
, ".ram" : "audio/x-pn-realaudio"
, ".rar" : "application/x-rar-compressed"
, ".rb" : "text/x-script.ruby"
, ".rdf" : "application/rdf+xml"
, ".roff" : "text/troff"
, ".rpm" : "application/x-redhat-package-manager"
, ".rss" : "application/rss+xml"
, ".rtf" : "application/rtf"
, ".ru" : "text/x-script.ruby"
, ".s" : "text/x-asm"
, ".sgm" : "text/sgml"
, ".sgml" : "text/sgml"
, ".sh" : "application/x-sh"
, ".sig" : "application/pgp-signature"
, ".snd" : "audio/basic"
, ".so" : "application/octet-stream"
, ".svg" : "image/svg+xml"
, ".svgz" : "image/svg+xml"
, ".swf" : "application/x-shockwave-flash"
, ".t" : "text/troff"
, ".tar" : "application/x-tar"
, ".tbz" : "application/x-bzip-compressed-tar"
, ".tcl" : "application/x-tcl"
, ".tex" : "application/x-tex"
, ".texi" : "application/x-texinfo"
, ".texinfo" : "application/x-texinfo"
, ".text" : "text/plain"
, ".tif" : "image/tiff"
, ".tiff" : "image/tiff"
, ".torrent" : "application/x-bittorrent"
, ".tr" : "text/troff"
, ".txt" : "text/plain"
, ".vcf" : "text/x-vcard"
, ".vcs" : "text/x-vcalendar"
, ".vrml" : "model/vrml"
, ".war" : "application/java-archive"
, ".wav" : "audio/x-wav"
, ".wma" : "audio/x-ms-wma"
, ".wmv" : "video/x-ms-wmv"
, ".wmx" : "video/x-ms-wmx"
, ".wrl" : "model/vrml"
, ".wsdl" : "application/wsdl+xml"
, ".xbm" : "image/x-xbitmap"
, ".xhtml" : "application/xhtml+xml"
, ".xls" : "application/vnd.ms-excel"
, ".xml" : "application/xml"
, ".xpm" : "image/x-xpixmap"
, ".xsl" : "application/xml"
, ".xslt" : "application/xslt+xml"
, ".yaml" : "text/yaml"
, ".yml" : "text/yaml"
, ".zip" : "application/zip"
}
};
exports.mime=mime;
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